Particle hair only works in Blender and is resource-hungry. I think there is a misunderstanding about the baking process and the desired result. So I have no idea why it isn't working and would love to have a solution for this problem. bake with alpha and not just plain black or white.baking directly on the hair particle object.the baking target as big as the hair particle object.Cages, Extrusion/Max Ray Distance with several different values.(why, what's up with those holes and squares) Now I stumbled upon something new for me: The duplicate got a material with a texture node and new texture for baking.I converted the particle system to curves, put bevel with caps on it in the curve settings and converted to mesh.I duplicated the hair cap, removed the particle system and used 'shrink/flatten' in edit mode so it lays over the hair from the other object.

I made a hair cap object, unwrapped it, put a hair particle system on and groomed it.

So I was trying to bake a hair cap for my character as base for yet another try to make good realtime hair.

Haircap download free